我印象中是看到租借卡组的选项，然后进入游戏之后就找不到，能有办法解决么
You mean having choice of rental decks, but don’t have actual cards of rental decks in collection? You have time for test rental decks, then you choose rental deck you liked most. After you choose, you get actual cards of chosen deck. And you can use that cards permenently.